手拉行车计算书1.0t -

'Calculationfor3THandGirderCrane1.0T手拉行车计算书1技术参数手动葫芦起升重量1000kg起升高度3.0m起升速度手动行走速度手动2工字梁刚度和强度的计算工字梁的参数工字梁型号I18b工字梁材料Q235-Bb=94mmh=180mmd=6.5mmt=10.7mmr=4.3mmR=8.5mmL≤2500mmIx=1660cm4Wx=185cm3Q1装载重量1000kgfGo手拉行车自重45kgf设计动态因素:1.15安全因素:1.52.1弯曲强度弯矩Mmax=(1.15Q1+Go)L/4=(1.15×1000+45)×250/4=74687.5kgf.cm弯曲应力σ=Mmax/Wx=74687.5/185=403.7kgf/cm2＜[σ0]［σ0］=2350/1.5(safefactor)=1650kgf/cm2∴安全2.2工字梁的刚度校核弹性横梁.f≤[f]=(1/700~1/1000)L取[f]=L/800=3.125mmf=(1.15Q1+Go)×L3/48×E×Ix=1195×2503/48×2.1×106×1660≈0.11mm=1.1mm＜[f]2.3轴的强度校核手动葫芦上的轴直径是42mm，材料为45#2.3.1支撑反力R’a=R’b=(1.15Q0+G’0)×L/2/L=(1.15×1000+15)×L/2/L=1165/2=582.5kgf Calculationfor3THandGirderCrane已知:L﹍﹍﹍﹍轴长L=12.8cmQ0﹍﹍﹍﹍承载负荷Q0=1000kgG’0﹍﹍﹍﹍手动葫芦自重G’0=15kg2.3.2轴的弯矩M’a=M’b=Ra×L/2=582.5×12.8/2=3728kgf.cm取M=M’a=3728kgf.cm2.3.3弯曲应力σ=M/W=3728/π2.53/32×2=1202.6kgf.cm2［σ0］=4000/1.5(safefactor)=2667kgf/cm2σ<[σ0]=2667kg/cm2已知:材料45号钢。淬火和回火后.[σ0]=4000kg.cm2所以安全。2.4校核梁的局部弯曲强度校核梁的局部弯矩强度校核工字梁边缘处的局部弯曲强度在轮子的集中力下校核工字梁边缘处的强度：我们计算支撑4轮负载的情况。中跨部分的弯曲应力包括梁整体的弯曲应力和在轮子接触下梁边缘处的弯曲应力,所以我们取他们的合力，校核强度。竖直方向载荷下梁的弯曲正应力RA＇=(1000+45)/4=261.3Kgl=1/2(2500-205)=1147.5mm工字梁边缘处弯曲应力的计算工字梁局部边缘处弯曲应力计算要注意以下几点:抗剪筋板根部的水平和垂直弯曲应力(point1)and轮子的支反力(point2),and在轮子自由边缘处水平和垂直平面的弯曲应力(point3),计算相关应力公式如下:（point1水平弯曲应力）（point1垂直弯曲应力） Calculationfor3.0THandGirderCrane（point2水平弯曲应力）（point2垂直弯曲应力）（point3垂直弯曲应力）公式中：K1、K2、K3、K4、K5——wheelpressureactingpositionratio，seefigure4-3-7[2],i—thedistancebetweenwheelpressureactingpointandwebreinforcementouterside,refertodrawingandcalculation，knowni=32.5㎜，aflangewidth，a=54㎜。So。Knownfromfigure：K1=0.53、K2=0.11、K3=0.295、K4=0.78、K5=0.62。Pp——singlerollermax.wheelpressure，Pp=261.3kg=2560.8N。t——flangethickness，t=10.7mm。Relevantdatatoaboveformula，known1)reluctantstressLowerflangesurfacepoint1resultantstressLowerflangesurfacepoint2resultantstressLowerflangesurfacepoint3resultantstress Calculationfor3.0THandGirderCraneSmallbendingstressfromhorizontalload,weneglectit.MaterialisQ235-B,whoseyieldstrength，I-beamlowerflangelocalbendingstressislessthanallowedstress.Soit’ssafe.3Strengthcheckofwheelcontactingfacingmaterial45HB=240-280Knownfromassemblydrawing,thereare4wheelssupportingtheloadForthesafetycalculateonly3wheelstocheckthestrengthofcontactingSurface.Known:Q1=1000kgfG=45kgfDesigndynamicfactor:1.15ReactionofthesupportonthewheelP=1/3(1.15Q1+G)=398kgfPartialcontactingstresswhenthesteelwheelandI-steelareinlinecontact.δt=600*(2P/bD)1/2=600*(2×398/3×11.4)1/2=2671kgf/cm2InequationbContactinglengthofthewheelandrackb=3cmDDiameterofwheeltakeD=11.4cmIt’sKnownfromdiagramthathardnessofcontactingsurfaceofthewheelisHB=320[δt]=6400~8000kgf/cm2∴Qualified.4StrengthcheckofwheelshaftChoosethelengthoftheactuatingarm3.4cm.Stresscheckindangeroussectionδ=M/W=398×3.4/0.1×2.52=877kgf/cm2＜[δ-1]Material#45steelQuenchedandtempered.[δ-1]=4000/1.5(safefactor)=2667kg/cm2So:itissafe.'